You might want to google class action suit with the brand name. IMHO. The plastic was not made with an anti-microbial and possibly a UV inhibitor. Either way, mold, algae, and fungus with disentegrate the material. Another issue is breakdown of the plastic (generically speaking)--if it is of poor quality it will be chalky which indicates it's breaking down. We just replaced under warranty an entire 2 story home's vynil siding because it was chalking.

Short of that, you can extend the life of the guards and the shingles by installing sacrificial zinc strips along the roof ridge. Rain dissolves the zinc coating everything the water contacts. These zinc strips aren't common here in the midwest but the are on the east coast. Sprays and cleaners will wash off. Any good roofing supply should have the zinc strips which nail easily to the ridge.

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